PSN-L Email List Message

Subject: RE: ARRIVAL TIMES: Quiet Before The Storm
From: "Steve Hammond" shammon1@.............
Date: Wed, 2 Sep 2009 22:06:22 -0700


I also noticed an anomaly in local events within 20-25km south of my old San
Jose location when I lived in south San Jose. My house was located between
the San Andreas and Calaveras faults and I had data from both faults that
had something going on just before the P wave arrived. I showed John Lahr
the data and asked if there was such a thing as  a  pre-P wave and he told
me there was not. I finally figured that it was a just a flaw in the sensor.


Regards, Steve Hammond

From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Barry Lotz
Sent: Wednesday, September 02, 2009 6:54 PM
To: psn-l@..............
Subject: Re: ARRIVAL TIMES: Quiet Before The Storm

 


Geoffrey
I've also noticed this for quite some time. I thought it was my sensors.
Maybe not.
Regards
Barry


--- On Wed, 9/2/09, Geoffrey  wrote:


From: Geoffrey 
Subject: ARRIVAL TIMES: Quiet Before The Storm
To: "PSN-LIST" 
Date: Wednesday, September 2, 2009, 5:50 PM

I have noticed in some Earthquakes you seem to notice
a short increase in quietness just before the impulse arrives.

Is this a real phenomena or simply a coincidence ?

Does this mean the real arrival time is
the beginning of the noticeable quiet ?

WHY THE QUIET ??
What physics would possibly muffle the noise ?

arrival of Possibly eP instead of simply P ?

Also,

What is the preferred format for a PSN files data ?
FLOAT or INTEGER
16 bit or 32 ?

My data is all 8 bit So should I expand it to
meet the new format ?

Comments ?

geoff
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


 












I also noticed an anomaly in local events within 20-25km = south of my old San Jose location when I lived in south San Jose. My house was located between the San Andreas and Calaveras faults and I had data from = both faults that had something going on just before the P wave arrived. I = showed John Lahr the data and asked if there was such a thing as  a =  pre-P wave and he told me there was not. I finally figured that it was a just = a flaw in the sensor.

Regards, Steve Hammond

From:= psn-l-request@.............. [mailto:psn-l-request@............... On = Behalf Of Barry Lotz
Sent: Wednesday, September 02, 2009 6:54 PM
To: psn-l@..............
Subject: Re: ARRIVAL TIMES: Quiet Before The = Storm

 

Geoffrey
I've also noticed this for quite some time. I thought it was my = sensors. Maybe not.
Regards
Barry


--- On Wed, 9/2/09, Geoffrey <gmvoeth@...........> = wrote:


From: Geoffrey <gmvoeth@...........>
Subject: ARRIVAL TIMES: Quiet Before The Storm
To: "PSN-LIST" <psn-l@..............>
Date: Wednesday, September 2, 2009, 5:50 PM

I have noticed in some Earthquakes you seem to = notice
a short increase in quietness just before the impulse arrives.

Is this a real phenomena or simply a coincidence ?

Does this mean the real arrival time is
the beginning of the noticeable quiet ?

WHY THE QUIET ??
What physics would possibly muffle the noise ?

arrival of Possibly eP instead of simply P ?

Also,

What is the preferred format for a PSN files data ?
FLOAT or INTEGER
16 bit or 32 ?

My data is all 8 bit So should I expand it to
meet the new format ?

Comments ?

geoff
__________________________________________________________

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